pub fn convert_base(num_str: &str, to_base: u32) -> String {
    // TODO: 这里写逻辑
    let (num, base) = num_str.split('(').collect_tuple().unwrap();
    let num = num.parse::<u32>().unwrap();
    let base = base.strip_suffix(')').unwrap();
    let base = base.parse::<u32>().unwrap();
    format!("{}({})", num, base)
}
